EP0077441B1 - Hohlnadel für ein- oder mehrmalige Blutentnahme mit Anzeige des Eintritts in eine Vene - Google Patents

Hohlnadel für ein- oder mehrmalige Blutentnahme mit Anzeige des Eintritts in eine Vene Download PDF

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Publication number
EP0077441B1
EP0077441B1 EP82107217A EP82107217A EP0077441B1 EP 0077441 B1 EP0077441 B1 EP 0077441B1 EP 82107217 A EP82107217 A EP 82107217A EP 82107217 A EP82107217 A EP 82107217A EP 0077441 B1 EP0077441 B1 EP 0077441B1
Authority
EP
European Patent Office
Prior art keywords
cannula
chamber
opening
housing
access opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82107217A
Other languages
English (en)
French (fr)
Other versions
EP0077441A2 (de
EP0077441A3 (en
Inventor
Edward L. Nugent
Joseph Kaufmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Becton Dickinson and Co
Original Assignee
Becton Dickinson and Co
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Filing date
Publication date
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Publication of EP0077441A2 publication Critical patent/EP0077441A2/de
Publication of EP0077441A3 publication Critical patent/EP0077441A3/en
Application granted granted Critical
Publication of EP0077441B1 publication Critical patent/EP0077441B1/de
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150015—Source of blood
    • A61B5/15003—Source of blood for venous or arterial blood
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150206—Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing device or sampling device
    • A61B5/150213—Venting means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150206—Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing device or sampling device
    • A61B5/150221—Valves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150206—Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing device or sampling device
    • A61B5/150259—Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150351—Caps, stoppers or lids for sealing or closing a blood collection vessel or container, e.g. a test-tube or syringe barrel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
    • A61B5/150381—Design of piercing elements
    • A61B5/150389—Hollow piercing elements, e.g. canulas, needles, for piercing the skin
    • A61B5/150404—Specific design of proximal end
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
    • A61B5/150381—Design of piercing elements
    • A61B5/150503—Single-ended needles
    • A61B5/150511—Details of construction of shaft
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
    • A61B5/150381—Design of piercing elements
    • A61B5/150503—Single-ended needles
    • A61B5/150519—Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
    • A61B5/150534—Design of protective means for piercing elements for preventing accidental needle sticks, e.g. shields, caps, protectors, axially extensible sleeves, pivotable protective sleeves
    • A61B5/150572—Pierceable protectors, e.g. shields, caps, sleeves or films, e.g. for hygienic purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150374—Details of piercing elements or protective means for preventing accidental injuries by such piercing elements
    • A61B5/150534—Design of protective means for piercing elements for preventing accidental needle sticks, e.g. shields, caps, protectors, axially extensible sleeves, pivotable protective sleeves
    • A61B5/150694—Procedure for removing protection means at the time of piercing
    • A61B5/150702—Procedure for removing protection means at the time of piercing fully automatically removed, i.e. the removing does not require any action by the user
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/150007—Details
    • A61B5/150732—Needle holders, for instance for holding the needle by the hub, used for example with double-ended needle and pre-evacuated tube
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/153—Devices specially adapted for taking samples of venous or arterial blood, e.g. with syringes
    • A61B5/154—Devices using pre-evacuated means
    • A61B5/1545—Devices using pre-evacuated means comprising means for indicating vein or arterial entry
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/15—Devices for taking samples of blood
    • A61B5/155—Devices specially adapted for continuous or multiple sampling, e.g. at predetermined intervals

Definitions

  • the invention relates to an assembly according to the first part of Claims 1 and 2.
  • Such an assembly utilizes a receiving chamber with walls which are translucent or transparent for visually indicating whether or not proper access to the sample in question has been achieved.
  • the chamber incorporates therein a reciprocal porous plug which plug is comprised of material which provides simultaneously a liquid barrier for the sample received, and a gas displacement discharge passage for gas displaced by the liquid sample received in the chamber.
  • the plug reciprocates in the chamber as required to first receive the liquid sample in question, while sealing the chamber against discharge of the sample, and simultaneously venting gas displaced by the liquid sample. Subsequently, when the liquid sample is to be discharged to a vacuum collection device, the plug reciprocates to cooperate with the discharge area of the assembly for allowing passage of the collected sample to discharge it to the vacuum collection device.
  • the known assembly is provided with a mechanism whereby the user of such a needle assembly can be informed when the intravenous needle has penetrated the vein of the patient for collection of a blood sample.
  • Many times in collecting blood from a patient it is difficult to locate the vein, or for other reasons blood flow into the collecting device is not adequate.
  • the plug allows for displacement of the air from the collection chamber so as to allow room .for receiving the blood sample being collected.
  • the plug is so arranged to be reciprocable in the chamber to cooperate with vents in a discharge negative pressure cannula in the assembly for first venting the displaced air during the receiving portion of the procedure for receiving the sample, and subsequently discharging the sample to the vacuum blood collection container when such a container is attached to the assembly.
  • the assembly of the invention includes a porous plug which vents the displaced air when the sample is received, and then moves in response to a pressure differential to open passages in the assembly to discharge the sample received into an evacuated blood collection container, when such container is attached to the assembly and the discharge negative pressure cannula penetrates into the vacuum of an evacuated collection container.
  • FR-A-2 134 516 describes a blood collection system, wherein the rearward part of a single cannula extending longitudinally through a housing and being adapted to penetrate through a stopper of a blood collecting container is covered by a flexible sleeve which surrounds the rearward needle end in an air-tight manner. Upon penetration of the rearward needle end into the stopper, the end of the sleeve is pierced by the needle point and the sleeve is slidingly pushed by the stopper along the rearward part of the needle. In each position of the sleeve, a stepped internal surface of the sleeve is in a sealing contact with the outer needle surface so that air cannot escape freely from the inside of the needle into the environment.
  • EPC Error Correction Code
  • the assembly incorporates a flexible sleeve which cooperates with the discharge opening of the device during periods of exchange of the vacuum collection devices for a subsequent discharge of an additional sample.
  • the assembly includes a flexible sleeve covering the discharge opening of the negative pressure cannula.
  • the flexible sleeve is so arranged to allow discharge from a third air discharge vent in the discharge cannula during the sample receiving procedure. Subsequently, the flexible sleeve is flexed and moved to cover this discharge opening when an evacuated blood collection container is inserted into the assembly for penetration by the negative pressure cannula.
  • the flexible sleeve again covers the discharge opening in the negative pressure cannula until such time as subsequently, an additional evacuated blood collection container is attached for a subsequent collection of a second sample.
  • this procedure may be repeated for collecting the number of samples required in individual evacuated blood collection containers.
  • Fig. 1 shows the basic external components of needle assembly 10, including a housing 12, a first needle cannula 14 adapted for insertion into a patient and a second negative pressure needle cannula 15 at the opposite end of housing 12.
  • the second needle cannula is adapted for penetration into an evacuated container 16 for collection of a blood sample.
  • Housing 12 includes a portion 25 having threads 18 adjacent second cannula 15 onto which a container holder 19 is threaded by its internal mating threads 20 at the forward end of the holder.
  • Evacuated container 16 is inserted into holder 19 so that second needle cannula 15 penetrates the stopper 21 at the forward end of the evacuated container 16.
  • housing 12 has a forward end 24 and a rearward end 25, with these ends being, preferably, separable in order to insert porous plug 27.
  • Forward end 24 is, preferably, cylindrical and has a large bore 28 therein for receiving in reciprocal manner porous plug 27 therein.
  • a smaller bore 29 is arranged to receive needle cannula 14 therein.
  • smaller bore 29 extends to a still smaller diameter channel 30 which interconnects bore 29 with bore 28.
  • a shoulder 33 is formed for receiving cannula 14 in an abutting relationship.
  • Cannula 14 may be held in bore 29 by a suitable adhesive.
  • channel 30 is not essential to the structure here, but is merely a preferred arrangement.
  • the diameter of channel 30 may be varied to provide a regulation of the fluid flow rate therethrough.
  • Forward end 24 of the housing also includes a number of longitudinal ribs 31 surrounding the outwardly extending cannula.
  • a needle shield (not shown) generally covers the outwardly extending needle cannula and includes mating internal ribs within. The mating ribs between the needle shield and the needle assembly allow the user to facilitate the insertion into or removal of the needle assembly from the tube holder.
  • Forward end 24 also includes an annular flange 32 which serves to provide a surface for joining the two portions of the housing together upon assembly. Once again, suitable fastening means, such as adhesives or the like, may be used to secure the two portions of the housing together.
  • Rearward end 25 includes a short protruding cylindrical portion 40, sized to fit within bore 28 of the forward end. At the opposite side of this rearward end, external threads 18 are provided on portion 26 of rearward end 25, as previously mentioned as a connection mechanism to the tube holder.
  • a bore 70 extends through rearward end 25 of the housing, which is similar to bore 29 in the forward end of the housing. Once again, bore 70 is sized to accept the diameter of a second needle cannula 15, which is secured to bore 70 by appropriate means such as adhesives, for example.
  • An annular flange 46 is arranged to cooperate with flange 32 in joining the ends 24, 25 of the housing together.
  • flanges 32 and 46 may be secured together by appropriate fastening means such as adhesives, for example.
  • the bore 28 of forward end 24 defines a tubular chamber 50 for receiving the liquid sample of interest.
  • the annular wall 88 of the forward end which defines chamber 50 is, preferably, comprised of a translucent or transparent material.
  • a translucent material such as a rigid thermoplastic, as will be appreciated by practitioners-in-the-art.
  • various sealed windows, ports or other means for a user to view the contents of chamber 50 are within the purview of this invention.
  • Porous plug 27 is mounted for reciprocation in bore 28, and includes an internal bore 72 for receiving in reciprocal engagement the front end of negative pressure cannula 15.
  • Porous plug 27, is cylindrical in shape, as will be appreciated, to conform to bore 28 and is of a size to engage the walls of chamber 50 in liquid sealing engagement but still of the size to allow reciprocation of plug 27 in bore 28 under the action of a pressure differential on opposite surfaces thereof.
  • Porous plug 27 is a gas permeable, liquid impermeable material arranged to allow the passage of a gas therethrough such as air, for example, but not liquid such as blood, for example.
  • a gas such as air, for example, but not liquid such as blood, for example.
  • polyethylene such as sintered polyethylene, or an open cell polyethylene foam, or other similar moldable polymeric materials, such as porous polypropylene, or porous polyfluoro- carbons.
  • a negative pressure cannula 15 includes a notch 74 adjacent the end 84 of the cannula 15.
  • the end 84 in this connection, is plugged or crimped or otherwise closed off while notch 74 provides communication between chamber 50 and the lumen of cannula 15, depending upon the positioning of porous plug 27.
  • An additional notch or opening 76 is also provided in cannula 15 to provide flow communication between the rear end 51 of chamber 50 and the lumen of cannula 15.
  • a third notch or opening 78 is provided which allows flow communication between the atmosphere or the external area around the assembly of the invention and the lumen of cannula 15.
  • FIG. 5 the needle assembly 10 is illustrated connected to a sample holder 19.
  • Cannula 14 is shown inserted into a patient P during the venipuncture.
  • I.V. cannula 14 enters the vein of patient P
  • blood flows from the vein through cannula 14 and reduced diameter passage 30 into chamber 50.
  • air therein is displaced from chamber 50 through porous plug 27.
  • porous plug 27 because of the character of porous plug 27, the blood does not pass therethrough.
  • Air passing through plug 27 is displaced from the chamber 50, through notches 74, 76 and then through the lumen of cannula 15 and out notch 78 in the area 82 (Fig.
  • the assembly includes the holder 19 mounted on the hub portion 26 of the rearward housing 25.
  • An evacuated blood collection container 16 is shown engaged in holder 19 with the resilient plug 21 thereof penetrated by the end or point 100 of negative pressure cannula 15. Because of the vacuum set up once cannula 15 penetrates stopper 21, this vacuum or negative pressure draws any air left in chamber 50 through porous plug 27 by communication between the internal area of evacuated container 16 through the lumen of cannula 15 and notches 74, 76. Because plug 27 is more occluded with blood, a pressure differential is built up between the upper chamber 50 and the lower chamber 51, the plug moves downwardly toward the face of extension 40 as shown in Fig. 3.
  • container 16 is removed from holder 19, thus causing the flexible sleeve 80 to move back to a position where it still blocks notch 78 and covers the end 100 of negative pressure cannula 15, thus allowing the I.V. needle 14 to remain in the vein without leakage for rendering the assembly available for the sequential placement of containers 16 in holder 19 for receiving multiple samples of blood.
  • notch 78 is not used in negative pressure cannula 15a.
  • like parts are numbered with the same reference numbers and the additional reference a.
  • a sleeve 90 is configured so as to be positioned always with its flange 108 adjacent and in close but gas non- sealing engagement with the surface 106a of extension 26a.
  • sleeve 90 is arranged for sliding engagement on cannula 15a.
  • it includes a plurality of internal grooves 94 with the inner points 95 of the grooves actually engaging the outer surfaces of cannula 15a.
  • the grooves therefore, provide gas communication between cannula end 100a and the upper end of sleeve 90 where the air leaks out between the adjacent surfaces of flange 108 of sleeve 90 and surface 106a of extension 26a.
  • the grooves 94 are of a size to allow passage of gas, but prevent passage of liquid. It will be appreciated that the upper surface of flange 108 may contain grooves, also, for providing a venting action between end 100a and the atmosphere.
  • a blood collecting needle assembly is provided in accordance with this invention for collecting either single or multiple samples, as required, in combination with an arrangement for indicating vein entry to the user of the assembly.
  • the arrangement here in the form of a simplified porous plug operating to provide, simultaneously, passage of a gas and blockage of a liquid, and to function as a valve is an extremely simplified and inexpensive arrangement of apparatus for manufacture. It is particularly appropriate for mass production techniques, as will be understood by practitioners-in-the-art.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Hematology (AREA)
  • Surgery (AREA)
  • Biophysics (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Manufacturing & Machinery (AREA)
  • Vascular Medicine (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Claims (7)

1. Hohlnadeleinrichtung zur ein- oder mehrmaligen Flüssigkeitsprobenentnahme aus einer Flüssigkeitsquelle zur nachfolgenden Abgabe in evakuierte Behälter, mit
a) einem Gehäuse (12), das ein vorderes Ende (24) und ein hinteres Ende (25) aufweist;
b) einer Probensammelkammer (50) in dem Gehäuse;
c) einer mit der Kammer (50) in Flüssigkeitsströmungsverbindung stehenden ersten Zutrittsöffnung (30) in dem vorderen Ende (24);
d) einer von der ersten Zutrittsöffnung nach außen ragenden ersten Kanüle (14) zum Einführen in die Flüssigkeitsquelle;
e) einer mit der Kammer (50) in Strömungsverbindung stehenden zweiten Zutrittsöffnung (70) in dem hinteren Ende (25);
f) einer zweiten Kanüle (15), die in der zweiten Zutrittsöffnung (70) angeordnet ist und sich in die Kammer (50) bis zu einer Stelle erstreckt, die zu der ersten Zutrittsöffnung (30) im Abstand liegt;
g) einer ersten und einer zweiten Öffnung (74, 76), die mit gegenseitigem Abstand in dem in die Kammer (50) ragenden Teil der zweiten Kanüle (15) ausgebildet sind und die die Kammer und das Lumen der zweiten Kanüle (15) strömungsmäßig miteinander verbinden und
h) einem gasdurchlässigen, flüssigkeitsundurchlässigen ringförmigen porösen Stopfen (27), der in der Kammer entlang der zweiten Kanüle (15) aus einer ersten Position, in der die erste Öffnung (74) von dem porösen Stopfen bedeckt und die zweite Öffnung (76) unbedeckt ist, in eine zweite Position hin- und herbewegbar ist, in der die erste Öffnung (74) unbedeckt ist;
i) wodurch bei Anschluß der ersten Kanüle (14) an die Flüssigkeitsquelle Flüssigkeit in die Kammer (50) gelangt, indem sie jegliches in dieser enthaltene Gas durch den porösen Stopfen (27) hindurch und durch die erste und zweite Öffnung (74, 76) aus der zweiten Kanüle (15) heraustreibt und der poröse Stopfen (27) sich beim Durchtritt der zweiten Kanüle (15) durch einen Stöpsel (21) eines evakuierten Behälters (16) unter dem Einfluß eines Differenzdruckes auf beiden Stopfenseiten gegen die zweite Zutrittsöffnung (70) bewegt, so daß die erste Öffnung (74) von der Abdeckung freikommt und durch die zweite Öffnung (76) auf der Unterdruckseite des Stopfens Restluft verdrängt wird und folglich Flüssigkeit aus der Kammer (50) durch die zweite Kanüle (15) zu dem evakuierten Behälter (16) fließt;
gekennzeichnet durch
eine dritte Öffnung (78) in dem aus dem Gehäuse (12) herausragenden Teil der zweiten Kanüle (15) und eine elastische Hülse (80), die sich über das der Kammer (50) entgegengesetzte Ende der zweiten Kanüle (15) erstreckt und beim Durchstechen der zweiten Kanüle (15) durch den Stöpsel (21) von dem Stöpsel (21) auf der zweiten Kanüle (15) verschoben wird, wobei die dritte Öffnung (78) von der Hülse (80) abdeckbar ist, wenn die zweite Kanüle (15) in einen evakuierten Behälter (16) eingedrungen ist.
2. Hohlnadeleinrichtung zur ein- oder mehrmaligen Flüssigkeitsprobenentnahme aus einer Flüssigkeitsquelle zur nachfolgenden Abgabe in evakuierte Behälter, mit
a) einem Gehäuse (12), das ein vorderes Ende (24) und ein hinteres Ende (25) aufweist,
b) einer Probensammelkammer (50) in dem Gehäuse;
c) einer mit der Kammer (50) in Flüssigkeitsströmungsverbindung stehenden ersten Zutrittsöffnung (30) in dem vorderen Ende (24);
d) einer von der ersten Zutrittsöffnung nach außen ragenden ersten Kanüle (14) zum Einführen in die Flüssigkeitsquelle;
e) einer mit der Kammer (50) in Strömungsverbindung stehenden zweiten Zutrittsöffnung (70) in dem hinteren Ende (25);
f) einer zweiten Kanüle (15), die in der zweiten Zutrittsöffnung (70) angeordnet ist und sich in die Kammer (50) bis zu einer Stelle erstreckt, die zu der ersten Zutrittsöffnung (30) im Abstand liegt;
g) einer ersten und einer zweiten Öffnung (74, 76), die mit gegenseitigem Abstand in dem in die Kammer (50) ragenden Teil der zweiten Kanüle (15) ausgebildet sind und die die Kammer und das Lumen der zweiten Kanüle (15) strömungsmäßig miteinander verbinden und
h) einem gasdurchlässigen, flüssigkeitsundurchlässigen ringförmigen porösen Stopfen (27), der in der Kammer entlang der zweiten Kanüle (15) aus einer ersten Position, in der die erste Öffnung (74) von dem porösen Stopfen bedeckt und die zweite Öffnung (76) unbedeckt ist, in eine zweite Position hin- und herbewegbar ist, in der die erste Öffnung (74) unbedeckt ist;
i) wodurch bei Anschluß der ersten Kanüle (14) an die Flüssigkeitsquelle Flüssigkeit in die Kammer (50) gelangt, indem sie jegliches in dieser enthaltene Gas durch den porösen Stopfen (27) hindurch und durch die erste und zweite Öffnung (74, 76) aus der zweiten Kanüle (15) heraustreibt und der poröse Stopfen (27) sich beim Durchtritt der zweiten Kanüle (15) durch einen Stöpsel (21) eines evakuierten Behälters (16) unter dem Einfluß eines Differenzdruckes auf beiden Stopfenseiten gegen die zweite Zutrittsöffnung (70) bewegt, so daß die erste Öffnung (74) von der Abdeckung freikommt und durch die zweite Öffnung (76) auf der Unterdruckseite des Stopfens Restluft verdrängt wird und folglich Flüssigkeit aus der Kammer (50) durch die zweite Kanüle (15) zu dem evakuierten Behälter (16) fließt;
gekennzeichnet durch
eine elastische Hülse (90), die die zweite Kanüle (15a) an ihrem der Kammer (50) entgegengesetzten Ende verschiebbar umgreift, wobei die Hülse (90) beim Durchstechen der zweiten Kanüle (15a) durch den Stöpsel (21) von dem Stöpsel (21) auf der zweiten Kanüle (15a) verschoben wird;
durch Ausbildung vieler längsverlaufender Rillen (94) an der gegen die Kanüle angreifenden Innenfläche der Hülse (90),
wobei die an die Kanüle (15a) angesetzten Rillen (94) gasdurchlässig und flüssigkeitsundurchlässig sind.
3. Einrichtung nach Anspruch 1 oder 2, ferner dadurch gekennzeichnet, daß
a) der poröse Stopfen (27) aus einem Körper gebildet ist, der aus der Gruppe ausgewählt ist, welche aus gesintertem Polyäthylen, offenzelligem Polyäthylenschaum; porösem Polyprobylen, porösen Polyfluorkohlenstoff-Verbindungen und Mischungen dieser Stoffe besteht.
4. Einrichtung nach eine der Ansprüche 1 bis 3, ferner gekennzeichnet durch
a) eine an dem Gehäuse (12) vorgesehene Anordnung zum Anschluß eines Halters (19) für den evakuierten Behälter (16).
5. Einrichtung nach Anspruch 4, ferner gekennzeichnet durch
a) einen mit dem Gehäuse (12) verbundenen Halter (19) für einen evakuierten Behälter (16).
6. Einrichtung nach einem der Ansprüche 1 bis 5, ferner gekennzeichnet durch
a) eine an dem Gehäuse (12) vorgesehene Anordnung zur Beobachtung des Inhaltes der Kammer (50).
7. Einrichtung nach Anspruch 6, ferner dadurch gekennzeichnet,
a) daß die Beobachtungsanordnung durchsichtige Gehäusewände (88) in der Nähe der Kammer (50) aufweist.
EP82107217A 1981-10-15 1982-08-10 Hohlnadel für ein- oder mehrmalige Blutentnahme mit Anzeige des Eintritts in eine Vene Expired EP0077441B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US311494 1981-10-15
US06/311,494 US4398544A (en) 1981-10-15 1981-10-15 Single and multiple sample needle assembly with vein entry indicator

Publications (3)

Publication Number Publication Date
EP0077441A2 EP0077441A2 (de) 1983-04-27
EP0077441A3 EP0077441A3 (en) 1984-08-15
EP0077441B1 true EP0077441B1 (de) 1987-05-06

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EP82107217A Expired EP0077441B1 (de) 1981-10-15 1982-08-10 Hohlnadel für ein- oder mehrmalige Blutentnahme mit Anzeige des Eintritts in eine Vene

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US (1) US4398544A (de)
EP (1) EP0077441B1 (de)
JP (1) JPS5867238A (de)
AU (1) AU549405B2 (de)
BR (1) BR8204680A (de)
DE (1) DE3276212D1 (de)
ES (1) ES516043A0 (de)
MX (1) MX151506A (de)
NZ (1) NZ201209A (de)
ZA (1) ZA825520B (de)

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Also Published As

Publication number Publication date
NZ201209A (en) 1984-11-09
ZA825520B (en) 1983-06-29
AU549405B2 (en) 1986-01-23
MX151506A (es) 1984-12-04
ES8306596A1 (es) 1983-06-01
BR8204680A (pt) 1983-08-02
JPS5867238A (ja) 1983-04-21
ES516043A0 (es) 1983-06-01
JPH0114780B2 (de) 1989-03-14
EP0077441A2 (de) 1983-04-27
US4398544A (en) 1983-08-16
DE3276212D1 (en) 1987-06-11
EP0077441A3 (en) 1984-08-15
AU8594082A (en) 1983-04-21

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